Improvement in processes for manufacturing cream tartar



Wi'H'AA-Sr mocnss FOR MANUFACTUMNGCR AM-mama Patents-c1 Feb. I ,187 6.'

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JULIUS .w. HAAS, or DUBU UE, IOWA.

IMPROVEMENT IN PROCESSES FOR MANUFACTURING CREAM TARTAR.

Specification forming part of Letters Patent No. 172,999, dated February1, 1876; applicationfiled October 1, 1875.

To all whom it may concern:

Be it known that I, JULIUS W. HAAs, of the city and county of Dubuqueand State of Iowa, have invented a new and useful Process and Method inthe Manufacture of Bitartrate of Potash, popularly known as Cream ofTartar; and do hereby declare that the following is a full, clear, andexact description thereof, reference being had to the accompanyingdrawings, making a part of this specification.

Figure 1 represents a vertical section of the copper cylinder used inthe process with steam and exhaust pipes. Fig. 2 represents. atransverse section thereof, and showing the top and man-hole.

I use in my process a copper cylinder placed and maintained in anupright position, A.

the bottom of the cylinder another pipe, 0,

extends for the purpose of exhausting and conducting away themother-water after T the crystallization of the cream of tartar hastaken place.

The advantages and merits of my process over any and all other methodsnow in use are that, by my process, a much larger percentage orproportion of the argols, can be and are dissolved. The crystalsobtained are larger and finer. The product of the cream of tartar islarger and chemically pure, and all further processes for the purpose ofeliminating impurities are rendered unnecessary, and a perfectly purebitartrate of potassa is produced at much less expense and cost than theordinary cream of tartar. By all other methods of manufacturing thebitartrate of potassa, a large amount of the tartrateof lime (O H GaO ofthe argols, and

is contained in the residuum.

Having described the apparatus and some of the advantages of my process,I will now proceed to describe the same.

The argols, after being ground are placed inthe cylinder A, the quantitydepending on the size of the cylinderabout eleven hundred pounds (1100)in one of the dimensions above given-to which are added the requisiteequivalents of hydrochloric acid (H 01) chemically pure, of thirty percent. gravity, and chloride of potassa (K 01.) The cylinder is filledwith water, and closed so as to be steamtight.

The following formula expresses the chemical changes and reactionsproduced, and taking place under a pressure of steam of the requisitedegreecontinued for three'(3) hours:

The steam is then turned 0E, and the cylinder and contents allowed toremain till the crystallization of the bitartrate of potassa iscomplete, which usually takes about three (3) days.

product, and left in the The mother-water is then drained 011' through.

the pipe '0 into another cylinder, chargedas the above, with theaddition of water sufficient to fill the same. By this means allundissolved tartrate of lime and uncrystallized bitartrate of potassaare saved and utilized.

The crystals of bitartrate of potassa deposited in the cylinder, and theinsoluble and foreign matter at the bottom can then be removed. Thisproduct of bitartrate of potassa is chemically pure. By adding thenecessary amount of animal charcoal when the argols are placed in thecylinder all coloring matter will be removed.

It will be observed that this process difi'ers essentially from thosehitherto employed, in that I do not efi'ect the solution of the argolsby ordinary boiling, nor by heating by means of a steam jacket. Byeither of these methods, which are the only ones now in use, a muchlonger time is required to effect the solution the requisite chemicalchanges.

-What I claim as my invention is stand till the crystallization of thebitartrate of potassa, is complete, all substantially in the mannerdescribed.

JULlUS W. HAAS.

Witnesses: I

M. H. BEACH, LOUIS G. HURD.

